Combine a pound of light brown sugar and a pound (four sticks) of butter until light and fluffy. Add two egg yolks and 1.5 teaspoons of vanilla; mix well. While it mixes, sprinkle in a pound of flour and half a teaspoon of salt. Spread this mixture in a well-greased 8.5″x11″ pan, and bake at 350 degrees for half an hour, until the bars are golden brown.
Meanwhile, chop up four ounces of walnuts or pecans, and get out a bag of milk chocolate chips. When the pan comes out of the oven, sprinkle most of the bag of chocolate chips onto the bars, wait a few minutes, and spread the melting chocolate evenly. Sprinkle with the chopped nuts. Cut into rectangles before it’s completely cooled.
Half a bag of chocolate chips creates a thin layer of chocolate; a full bag creates a very thick layer.
Try not to eat them all in one sitting.